Alternative fuel incinerator for cement kiln

Abstract

The utility model belongs to the technical field of cement kiln hazardous waste co-processing, and particularly relates to a cement kiln alternative fuel incinerator. A cement kiln alternative fuel incinerator comprises an incinerator body, a blanking platform, a step-shaped combustion platform, a pushing device, a blowing device, a main air inlet, a material inlet and a decomposing furnace connector, the main air inlet, the material inlet and the decomposing furnace connector are arranged on the incinerator body, a C-shaped air guide plate is fixedly connected to the front end face of the combustion platform, and a plurality of air guide holes are formed in the front end face of the air guide plate. An air guide pipe is fixedly connected to the outer side surface of the furnace body at one end of the air guide plate, the air guide pipe is communicated with an inner cavity of the air guide plate, and tertiary air is introduced into the air guide pipe; the blowing device comprises an air cannon fixedly connected to the outer side of the furnace body and a blowing head communicated with the air cannon and arranged below the air guide plate. The combustion temperature fluctuation in the incinerator can be reduced, and the heating uniformity of alternative fuel can be improved so as to improve the combustion efficiency of the alternative fuel.

Description

Technical Field

[0001] The utility model belongs to the technical field of cement kiln hazardous waste coordinated disposal, and in particular relates to a cement kiln alternative fuel incinerator. Background Art

[0002] At present, the technology of "alternative fuel incinerator + cement kiln decomposition furnace" is widely used in the cement industry. It uses solid waste, semi-solid and liquid waste as alternative fuels, and pre-burns the alternative fuel through the incinerator before entering the kiln system, so as to use the heat of the alternative fuel to pre-decompose the cement raw material in the cement kiln to produce cement clinker, thereby saving coal. At the same time, the ash and waste gas after combustion are disposed of through the cement kiln system. The above technical route avoids the disturbance of the kiln working conditions caused by the direct entry of alternative fuel into the decomposition furnace, resulting in a decrease in the quality of cement clinker. In addition, it can also centrally treat hazardous waste to make full use of the calorific value in the waste and realize the harmless, resource-based and reduced disposal of hazardous waste.

[0003] In the prior art, for example, the Chinese utility model patent with application number 202221014362.2 discloses a stepped pre-combustion furnace, which includes a step device and a furnace. The step device is arranged at the bottom of the furnace and is a step-like structure that rises step by step. It also includes: a blowing device and a pushing device. The furnace is an arched cavity structure arranged on the step device, obliquely covered along the step device, and a feed port is arranged on the furnace shell; the blowing device is arranged below the step device in the form of a gas tank; the blowing device is provided with a blowing head and connected to the furnace, and the pushing device is arranged at the end of the extended platform of the uppermost level of the step device. This equipment enables the material to form a stable burning material layer in the furnace, and the generated combustion flue gas is introduced into the decomposition furnace for further combustion, ensuring stable and continuous feeding. The equipment has high compatibility and high stability.

[0004] In the above technical scheme, in order to disperse the alternative fuel on the step and avoid its coking and accumulation, a blowing device such as an air cannon is adopted. Although this structure can blow away the alternative fuel, since it blows cold air, it causes large temperature fluctuations in the pre-combustion furnace. Especially when the blowing frequency is large, the optimal temperature for the combustion of the alternative fuel in the pre-combustion furnace is difficult to achieve. In addition, the tertiary air introduced into the furnace mostly acts on the surface and the upper and middle layers of the alternative fuel. The temperature of the lower and middle layers and the bottom layer of the alternative fuel on the step is lower than that of the surface and the upper and middle layers, so that the alternative fuel cannot be heated uniformly, resulting in low combustion efficiency. Utility Model Content

[0005] In order to solve at least one technical problem existing in the prior art, the present application provides a cement kiln alternative fuel incinerator which reduces the combustion temperature fluctuation in the incinerator, improves the heating uniformity of the alternative fuel and improves the combustion efficiency of the alternative fuel.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A cement kiln alternative fuel incinerator comprises a furnace body, a material dropping platform arranged in the furnace chamber of the furnace body, a stepped combustion platform connected to the material dropping platform and extending downward to form a pusher for pushing the alternative fuel on the material dropping platform, a blowing device arranged corresponding to the combustion platform, and a main air inlet, a material inlet, and a decomposition furnace interface respectively arranged on the furnace body, a C-shaped air guide plate is fixedly connected to the front end surface of the combustion platform, a plurality of air guide holes are opened on the front end surface of the air guide plate, an air guide duct is fixedly connected to the outer side surface of the furnace body at one end of the air guide plate, the air guide duct is connected to the inner cavity of the air guide plate, and tertiary air is introduced into the air guide duct; the blowing device comprises an air cannon fixedly connected to the outside of the furnace body and a blowing head connected to the air cannon and arranged below the air guide plate.

[0008] Preferably, the air guide holes are provided in two groups on the upper and lower front end surface of the air guide plate.

[0009] Preferably, a plurality of air outlets are provided on the lower end surface of the air guide plate, and the plurality of air outlets are arranged along the length direction of the air guide plate.

[0010] Preferably, the air outlet is formed by extending the front end surface of the guide plate toward the inner side thereof, and the front end surface of the blowing port of the blowing head is inside the inner side surface of the front end surface of the guide plate.

[0011] Preferably, three groups of blowing devices are correspondingly arranged at each of the combustion platforms.

[0012] Preferably, a connecting pipe is fixedly connected to the outer side of the furnace body at the other end of the air guide plate, one end of the connecting pipe is connected to the air cannon and the other end is connected to the inner cavity of the air guide plate.

[0013] Preferably, the upper end surface of the blowing head is an inclined structure, and the height of the front end surface of the blowing head is lower than the height of the rear end surface thereof.

[0014] Preferably, an observation port is provided on the furnace body corresponding to each of the combustion platforms.

[0015] Preferably, an inspection opening is provided on the furnace body corresponding to the blanking platform.

[0016] Preferably, the material inlet includes a fixed alternative fuel inlet, a semi-solid and liquid alternative fuel inlet, and a raw material inlet.

[0017] Compared with the prior art, the beneficial effects of the utility model are:

[0018] The utility model provides an air guide plate, an air guide hole and an air guide pipe. After tertiary air is introduced into the inner cavity of the air guide plate, the tertiary air enters the furnace through the air guide hole, thereby heating the middle and lower parts of the alternative fuel located at the combustion platform, thereby achieving uniform heating of the alternative fuel to improve the combustion efficiency; in addition, while the alternative fuel is uniformly heated, when cold air is sprayed into the furnace through the blowing device to disperse the alternative fuel, the tertiary air continuously introduced from the air guide plate can offset the heat loss in the furnace caused by the injected cold air, thereby achieving further reduction of temperature fluctuations in the furnace when the blowing frequency is large.

[0019] By setting the air outlet, the tertiary air entering the furnace from the air guide plate can heat the lower part of the alternative fuel, further improving the uniformity of heating of the alternative fuel; in addition, the tertiary air continuously entering the furnace from the air outlet can also offset to a certain extent the negative pressure area formed locally at the blowing head after the blowing device blows, thereby avoiding the blowing head being blocked by materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0021] Figure 2 This is a partial structural schematic diagram of the utility model from the first viewing angle.

[0022] Figure 3 This is a partial structural schematic diagram of the utility model from a second viewing angle.

[0023] Figure 4 This is a partial structural schematic diagram of the utility model from a third viewing angle.

[0024] Figure 5 It is a schematic diagram of a partial structure of a half section of the utility model.

[0025] Figure 6 for Figure 5 Schematic diagram of the enlarged structure at A.

[0026] Figure 7 It is a structural schematic diagram of the air guide plate of the utility model.

[0027] Figure 8 It is a schematic structural diagram of the blowing device of the utility model.

[0028] In the figure: 1. furnace body, 11. furnace, 12. main air inlet, 13. decomposition furnace interface, 14. fixed alternative fuel inlet, 15. semi-solid and liquid alternative fuel inlet, 16. raw material inlet, 17. observation port, 18. inspection port, 19. air duct,

[0029] 21. Dropping platform, 22. Combustion platform,

[0030] 3. Pushing device, 31. Sealing box, 32. Pushing plate,

[0031] 4. air guide plate, 41. upper plate, 42. front plate, 421. air guide hole, 43. lower plate, 431. air outlet, 44. support plate,

[0032] 5. Blowing device, 51. Air cannon, 52. Blowing head, 53. Connecting pipe. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0034] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention. Example

[0035] See attached Figure 1 As shown, a cement kiln alternative fuel incinerator includes a furnace body 1, the lower part of the furnace body 1 is stepped and the upper part is an arched structure, and the furnace 11 formed by the lower and upper parts of the furnace body 1 provides a combustion space for alternative fuels. The furnace body 1 is respectively provided with a main air inlet 12, a material inlet, and a decomposition furnace interface 13, wherein the material inlet includes a fixed alternative fuel inlet 14, a semi-solid and liquid alternative fuel inlet 15, and a raw material inlet 16. The main air inlet 12 is arranged at the top of the furnace body 1, and the material inlet and the raw material inlet 16 are arranged on both sides of the main air inlet 12, and the main air inlet 12 can be introduced into tertiary air. The raw material inlet 16 can be used to put cement raw materials to adjust the temperature in the furnace 11, and can also pre-process cement; the fixed alternative fuel inlet 14 can put fixed alternative fuels into the furnace 11, and the semi-solid and liquid alternative fuel inlet 15 can put semi-solid and liquid alternative fuels into the furnace 11. The decomposition furnace structure 13 is used to be connected to the decomposition furnace so as to transfer the heat generated in the incinerator into the decomposition furnace.

[0036] It should be noted that the above-mentioned tertiary air refers to: in the production of new dry cement, the high-temperature clinker discharged from the kiln head of the cement rotary kiln is rapidly cooled by the grate cooler, and the cooling medium air of the high-temperature clinker is heated from room temperature to 850-1100°C. Part of the heated high-temperature air (secondary air) enters the rotary kiln for the combustion of pulverized coal at the kiln head, and the other part enters the decomposition furnace at the kiln tail for the combustion of pulverized coal in the decomposition furnace. This part of high-temperature air is the "tertiary air".

[0037] See also Figure 1 , 2 As shown in Figures 3, 4, and 5, a material drop platform 21 is provided in the furnace 11 below the main air inlet 12, and the alternative fuel dropped from the material inlet first falls onto the material drop platform 21. A step-shaped combustion platform 22 extending downward is connected to the front end of the material drop platform 21. The combustion platform 22 is a multi-step structure, and the specific number of steps can be adjusted according to actual needs. Since the alternative fuel will burn on the combustion platform 22, the combustion platform 22 is made of refractory material. In order to push the alternative material on the material drop platform 21 to the combustion platform 22, the incinerator also includes a pushing device 3. The specific structure of the pushing device 3 and the connection method with the furnace body 1 are prior art, which will not be repeated here. For example, it includes a sealed box 31, a hydraulic cylinder (not shown in the figure) arranged in the sealed box 31 along its length direction, and a push plate 32 arranged horizontally and connected to the guide rod of the hydraulic cylinder. The reciprocating motion of the push plate 32 driven by the hydraulic cylinder is used to realize the pushing effect on the alternative fuel.

[0038] Furthermore, observation ports 17 are provided on the furnace body 1 corresponding to both ends of each combustion platform 22. The observation ports 17 are used to see the combustion and accumulation of alternative fuels on the combustion platform 22. An observation door or other existing high-temperature resistant transparent materials are sealed on the observation ports 17. An inspection port 18 is provided on the furnace body 1 corresponding to the top of the material drop platform 21. An inspection door is installed on the inspection port 18. When the interior of the furnace body 1 needs to be inspected, the inspection port 18 can be opened to enter the furnace 11 for inspection.

[0039] See also Figure 5 , 6 As shown in Figures 7 and 8, a C-shaped air guide plate 4 is fixedly connected to the front end face of each step combustion platform 22, and includes a horizontally arranged upper plate 41, a vertically arranged front plate 42 connected to the front end of the upper plate 41, a horizontally arranged lower plate 43 connected to the front end face of the front plate 42, and a support plate 44 welded to the lower end face of the lower plate 43, and the lower end face of the support plate 44 is fixed on the combustion platform 22. The air guide plate 4 is made of refractory material.

[0040] A plurality of air guide holes 421 are provided on the front face of the air guide plate 4, i.e., the front plate 42. Two groups of air guide holes 421 are provided on the upper and lower front face of the air guide plate 4. An air guide duct 19 is welded to the outer side of the furnace body 1 at one end of the air guide plate 4. The air guide duct 19 is connected to the inner cavity of the air guide plate 4. Tertiary air is introduced into the air guide duct 19. A plurality of air outlets 431 are provided on the lower end face of the air guide plate 4, i.e., the lower plate 43. The plurality of air outlets 431 are provided along the length direction of the air guide plate 4. Thus, the tertiary air can enter the inner cavity of the air guide plate 4 through the air guide duct 19 and enter the furnace 11 through the air guide holes 421 and the air outlets 431 to heat the middle and lower parts of the substitute material.

[0041] The incinerator also includes a blowing device 5 corresponding to each combustion platform 22. The blowing device 5 includes an air cannon 51 fixedly connected to the outside of the furnace body 1, a blowing head 52 connected to the air cannon 51 and arranged below the lower plate 43 of the air guide plate 4, and a connecting pipe 53 connecting the blowing head 52 and the air cannon 51. Three groups of blowing devices 5 are correspondingly arranged at each combustion platform 22.

[0042] Furthermore, in this embodiment, in order to prevent the air guide hole 421 and the air outlet 431 from being blocked, a connecting pipe 53 is welded to the outer side of the furnace body 1 at the other end of the air guide plate 4, one end of the connecting pipe 53 is connected to the air cannon 51 and the other end is connected to the inner cavity of the air guide plate 4. By introducing high-pressure gas into the inner cavity of the air guide plate 4, the air guide hole 421 and the air outlet 431 are prevented from being blocked.

[0043] Furthermore, in order to prevent the blowing head 52 from affecting the air outlet 431 , the upper end surface of the blowing head 52 is an inclined structure, and the height of the front end surface of the blowing head 52 is lower than the height of the rear end surface thereof.

[0044] Furthermore, in order to prevent the blowing head 52 from spraying high-pressure air and forming a negative pressure area near the blowing head 52, thereby causing smoke to be sucked into this area and block this area and the blowing head 52, in this embodiment, the air outlet 431 is formed by extending the front end face of the guide plate 4, that is, the front plate 42 toward the inner side thereof, and the front end face of the blowing port of the blowing head 52 is inside the inner side of the front plate 42. Since the tertiary air continuously enters the furnace 11 through the air outlet 431, after the blowing head 52 sprays high-pressure air, the tertiary air quickly fills the negative pressure area here.

[0045] The working process of the embodiment of the utility model is as follows:

[0046] Solid alternative fuel, semi-solid and liquid alternative materials enter the furnace 11 from the corresponding fixed alternative fuel inlet 14, semi-solid and liquid alternative fuel inlet 15 respectively and fall onto the blanking platform 21. The pushing device 3 pushes the alternative fuel on the blanking platform 21 to the combustion platform 22. The high-temperature tertiary air introduced from the main air inlet 12 causes the alternative fuel on the combustion platform 22 and the blanking platform 21 to burn. The tertiary air continuously enters the inner cavity of the air guide plate 4 from the air guide duct 19 and enters the furnace through the air guide hole 421 and the air outlet 431 to heat the alternative fuel to promote its combustion. In order to make the alternative fuel burn fully, the air cannon 51 sends high-speed air flow from the nozzle 52 The alternative fuel is sprayed out to ensure that it is in a floating state in the furnace 11 so as to fully contact and burn with the high-temperature hot air. The incompletely burned alternative fuel falls on the combustion platforms 22 at each level in turn for subsequent combustion. A temperature sensor can be set in the furnace 11 to monitor the temperature in the furnace 11. When the temperature is too high, cement raw material can be added into the furnace 11 from the raw material inlet 16 to reduce the temperature in the furnace 11. In order to avoid the air guide holes 421 and the air outlet 431 being blocked, a high-pressure air flow can be periodically introduced into the inner cavity of the air guide plate 4 through an air cannon 51 set at one end of the air guide plate 4. After the alternative fuel is burned, the useful flue gas enters the decomposition furnace from the decomposition furnace interface 13 for the next step of processing.

[0047] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A cement kiln alternative fuel incinerator, comprising a furnace body, a material drop platform arranged in the furnace chamber of the furnace body, a step-shaped combustion platform connected to the material drop platform and extending downward, a pushing device for pushing the alternative fuel on the material drop platform, a blowing device arranged corresponding to the combustion platform, and a main air inlet, a material inlet, and a decomposition furnace interface respectively arranged on the furnace body, characterized in that: A C-shaped air guide plate is fixedly connected to the front end surface of the combustion platform, a plurality of air guide holes are opened on the front end surface of the air guide plate, an air guide pipe is fixedly connected to the outer side surface of the furnace body at one end of the air guide plate, the air guide pipe is connected to the inner cavity of the air guide plate, and tertiary air is introduced into the air guide pipe; The blowing device comprises an air cannon fixedly connected to the outside of the furnace body and a blowing head connected to the air cannon and arranged below the air guide plate.

2. A cement kiln alternative fuel incinerator according to claim 1, characterized in that: The air guide holes are arranged in two groups in the upper and lower parts on the front end surface of the air guide plate.

3. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: A plurality of air outlets are provided on the lower end surface of the air guide plate, and the plurality of air outlets are arranged along the length direction of the air guide plate.

4. A cement kiln alternative fuel incinerator according to claim 3, characterized in that: The air outlet is formed by extending the front end surface of the guide plate toward the inner side thereof, and the front end surface of the blowing port of the blowing head is inside the inner side surface of the front end surface of the guide plate.

5. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: Three groups of blowing devices are correspondingly arranged at each of the combustion platforms.

6. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: A connecting pipe is fixedly connected to the outer side of the furnace body at the other end of the air guide plate, one end of the connecting pipe is connected to the air cannon and the other end is connected to the inner cavity of the air guide plate.

7. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: The upper end surface of the blowing head is an inclined surface structure, and the height of the front end surface of the blowing head is lower than the height of the rear end surface thereof.

8. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: An observation port is provided on the furnace body corresponding to each combustion platform.

9. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: An inspection opening is provided on the furnace body corresponding to the material dropping platform.

10. The cement kiln alternative fuel incinerator according to claim 1, characterized in that: The material imports include fixed alternative fuel imports, semi-solid and liquid alternative fuel imports, and raw material imports.

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